import React, { Component } from 'react'
// 引入store
import store from '../../redux/store'
import {createDecrementAction,createIncrementAction} from '../../redux/count_action'  
export default class Count extends Component {
    componentDidMount() {
        // redux中的监听
        store.subscribe(() => {
            // 
            this.forceUpdate()
        })
    }
    increment = ()=> {
        const {value} = this.selectNumber
    
        // redux中的action
        store.dispatch(createIncrementAction(value*1))
    }
    // 减法
    decrement = ()=> {
        const {value} = this.selectNumber
        store.dispatch(createDecrementAction(value*1))


    }
    incrementIfOdd = ()=> {
        const {value} = this.selectNumber
        const count = store.getState()
        if(count % 2 !== 0) {
        store.dispatch(createIncrementAction(value*1))

    }
}
    // 异步加
    incrementAsync = ()=> {
        const {value} = this.selectNumber
        setTimeout(()=> {
        store.dispatch(createIncrementAction(value*1))
        }, 1000)
    }

    render() {
        return (
            <div>
                <h1>当前求和为： {store.getState()}</h1>
                <hr />
                <select name="" id="" ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select> &nbsp;
                <button onClick={this.increment}>+</button> &nbsp;
                <button onClick={this.decrement}>-</button> &nbsp;
                <button onClick={this.incrementIfOdd}>当前求和为奇数加</button> &nbsp;
                <button onClick={this.incrementAsync}>异步加</button>

            </div>
        )
    }
}
